The unit sports some relatively decent specs, 25ms response which seems to be the norm these days. We see a 500:1 contrast ratio and a brightness level of 250cd/m2. The contrast ratio seems to be the only real change between the 171n and the 191n in terms of screen performance. With that said, the only real difference between the two is the larger screen area, a better contrast ratio, and a few additional features which we will discuss next.